Research on Rotary Magnetorheological Finishing of the Inner Surface of Stainless Steel Slender Tubes
Abstract
1. Introduction
2. Principle and Methods
2.1. Material Removal Principle
2.1.1. Influence of Magnetic Particles
2.1.2. Influence of Abrasive Particles
2.1.3. Polishing Principle
2.2. Model Building of Simulation
2.3. Experimental Methods
3. Results
3.1. Simulation Results
3.2. Experiment Results
3.2.1. Influence of Volume Content of CIPs on Surface Roughness
3.2.2. Influence of Volume Content of Abrasive Particles on Surface Roughness
3.2.3. Influence of CIP Size on Surface Roughness
3.2.4. Influence of Abrasives Size on Surface Roughness
3.2.5. Influence of Processing Time on the Surface Roughness
4. Conclusions
- Transient and steady-state analyses of the magnetorheological polishing process were conducted under the multiphysics coupling of magnetic and flow fields to investigate the influence of various factors, including magnetic field strength, body force under the magnetic field, shear stress, and viscosity, on the material removal process. The force generated under the magnetic field is primarily concentrated in the region opposite the center of the magnets and has good synchronization with the movement of the magnetic field, thereby allowing for precise control of the material removal behavior of the MPF on the workpiece surface by controlling the magnetic field distribution.
- The feasibility of the proposed polishing method was validated through processing experiments, the relationship between surface roughness and various parameters of the MPF was investigated using single-variable experiments, and the composition of the magnetorheological polishing solution was optimized. The optimal formulation consisted of 45 vol% CIPs, 20 vol% alumina abrasives, 1 vol% hydroxypropyl methylcellulose, and 34 vol% deionized water, with the optimum average sizes for both the CIPs and the alumina abrasives being 7 μm.
- Utilizing the optimum formulation, the effect of processing time on surface roughness was investigated. Under the optimum time, the internal surface roughness of the 316L stainless steel slender tube workpiece was reduced from Sa 320 nm to Sa 28 nm, and the Sz was reduced from 10.972 μm to 0.3 μm, which effectively eliminated the initial surface defects and obtained a flat and smooth surface.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Parameters | Value |
---|---|
Density | 2.7 g/m3 |
Relative magnetic permeability | 2.63 |
Plasticity viscosity | 11.34 Pa∙s |
Parameters | Value |
---|---|
Workpiece | D = 10 mm, d = 9 mm, L = 150 mm 316 L stainless steel |
Bar magnet | 6 mm × 6 mm × 12 mm Nd-Fe-B, Br = 0.5 T |
Magnetic field intensity of machined surface | 0.25 T |
Rotation speed of the magnetic field | 150 rpm |
Distance of workpiece movement | 20 mm |
Speed of workpiece movement | 1.1 mm/s |
Processing time | 10 h |
Parameters | Value |
---|---|
Volume content of CIPs (vol.%) | 40, 45, 50, 55 |
Volume content of abrasives (vol.%) | 12, 16, 20, 24 |
Volume content of hydroxypropyl methylcellulose (vol.%) | 1 |
Size of CIPs (μm) | 3.5, 7, 10.5, 14 |
Size of abrasives (μm) | 3.5, 7, 10.5, 14 |
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Luo, Z.; Wu, C.; Jin, Z.; Guo, B.; Gao, S.; Luo, K.; Liu, H.; Chen, M. Research on Rotary Magnetorheological Finishing of the Inner Surface of Stainless Steel Slender Tubes. Micromachines 2025, 16, 763. https://doi.org/10.3390/mi16070763
Luo Z, Wu C, Jin Z, Guo B, Gao S, Luo K, Liu H, Chen M. Research on Rotary Magnetorheological Finishing of the Inner Surface of Stainless Steel Slender Tubes. Micromachines. 2025; 16(7):763. https://doi.org/10.3390/mi16070763
Chicago/Turabian StyleLuo, Zhaoyang, Chunya Wu, Ziyuan Jin, Bing Guo, Shengdong Gao, Kailei Luo, Huiyong Liu, and Mingjun Chen. 2025. "Research on Rotary Magnetorheological Finishing of the Inner Surface of Stainless Steel Slender Tubes" Micromachines 16, no. 7: 763. https://doi.org/10.3390/mi16070763
APA StyleLuo, Z., Wu, C., Jin, Z., Guo, B., Gao, S., Luo, K., Liu, H., & Chen, M. (2025). Research on Rotary Magnetorheological Finishing of the Inner Surface of Stainless Steel Slender Tubes. Micromachines, 16(7), 763. https://doi.org/10.3390/mi16070763